update for new Gyazz.com

use bundler style gem template

delete Manifest.txt, PostInstal.txt

delete pkg directory

update .gitignore

convert README.rdoc -> README.md

add LICENSE.txt

fix Makefile

add Gemfile and Gemfile.lock

add dependency "json" gem

use "httparty" gem

Gyazz::Wiki#pages, Gyazz::Page#text, Gyazz::Page#data

Gyazz::Page#access, Gyazz::Page#modify

Gyazz::Page.text="page body"

Gyazz::Page#related_pages